... ) rational design,easy installation and maintenance SV2 Direct-acting solenoid valves :SV1.6, SV2, SV3 direct-acting solenoid valves feature compact structure ... use full-closed magnetic coil and DIN international standard electric plug, so it is characterized by its good insulation, waterproof, ... off the valve seat.While de-energized in the coil,plug stem will drop and close the valve port because of ...